Spark arrester



Sept. 25, 1962 'r. w. DWYER SPAR-K ARRESTER Filed Dec. 14, 1960INVENTOR. THOMAS WILLIAM owvsg 6 es 9 o e e e co 9 e o o o e as l 00 eQQQQQQQQG Q6686 Iill n Q 5| u a oo W, 0 0 ||Jall1 o (HHrIE [Illlll I uiq I J f w. M 2 I v. m

3,055,160 SPARK ARRESTER Thomas William Dwyer, Badger, Grand Falls Dist,Newfoundland, Canada Filed Dec. 14, 1960, Ser. No. 75,832 4 Claims. (Cl.55-482) This invention relates to fines and more particularly to a sparkarrester therefor.

It is an object of the present invention to provide a spark arrester forpreventing the flow of sparks outwardly through a flue of a burner ofany particular type.

A further object of the present invention is to provide a spark arresterof the aforementioned type which can be manually actuated to dislodgesolid particles from gas exhaust ports, thus assuring proper control atall times.

All of the foregoing and still further objects and advantages of thisinvention will become apparent from a study of the followingspecification, taken in connection with the accompanying drawing,wherein:

FIGURE 1 is a fragmentary side elevational view of a flue having a sparkarrester made in accordance with the present invention;

FIGURE 2 is an enlarged framentary cross sectional view of the mainoperating parts of the assembly shown in FIGURE 1;

FIGURE 3 is a fragmentary perspective view of the side of the blockingmember forming a part of the present invention;

FIGURE 4 is a view similar to FIGURE 3, showing the opposite side of themain body portion;

FIGURE 5 is an enlarged fragmentary cross sectional view of the mainoperating parts of the assembly shown in FIGURE 1;

FIGURE 6 is a perspective view of a shaft forming another part of thepresent invention; and

FIGURE 7 is a side view of the assembly shown in FIGURE 1.

Referring now to the drawing, a spark arrester assembly 10 made inaccordance with the present invention is shown to include a main conduit12 which serves as a flue for exhausting gases from a combustion unit14. Mounted within the longitudinal bore of the cylindrical flue pipe 12is a main body member 16 of generally hollow spherical configurationhaving a plurality of ports 18 extending through the surface thereofaround the entire surface area of this member.

It will be evident from FIGURE 2 that the spherical member 16 virtuallyblocks the flow of all solid particles through the conduit 12 from thelower to the upper end thereof, while permitting the flow of exhaustgases therethrough by means of the ports 18.

One side of the main body member 16 is provided with a cylindricalsocket 20 which rotatably receives the inwardly projecting end of amounting stud 22 carried inside of the fiue pipe 12. The diametricallyopposite side of the member 16 is provided with a non-circular recess 24within which a similarly shaped non-circular stud portion 26 of a dryshaft 28 is received. This shaft 28 is rotatably mounted upon thediametrically opposite side of the pipe 12 from the bearing pin 22 bymeans of a lock pin 25, and is used to rotate the main blocking member16 by means of a handle 30 secured to the shaft 28 by a lock pin 29. Ahand grip 32 is secured to the outermost end of the handle 30 tofacilitate the rotation thereof.

It will now be recognized that in actual use, all solid particles areprevented from flowing upwardly through the flue pipe 12 by the blockingmember 16. However, flue gases are permitted to escape through the ports18. In the event that solid particles block some of the passages throughthe ports 18, the main body member can be briskly rotated by the handle30, to dislodge such particles therefrom, thus providing for thecontinued operation of the assembly.

While this invention has been described with particular reference to theconstruction shown in the drawing, it is to be understood that such isnot to be construed as imparting limitations upon the invention, whichis best defined by the claims appended hereto.

Having thus described my invention, I claim as new and desire to secureby Letters Patent:

1. A spark arrester comprising, in combination, a conduit for exhaustingcombustion gases, a hollow spherical member having its surfaceperforated, the perforations permitting said gases to flow therethrough,said member blocking the passage of solid particles therethrough, andmanually operated means for actuating said member to discharge solidparticles from blocking gas flow through said perforations.

2. A spark arrester as set forth in claim 1, wherein said conduitcomprises a substantially cylindrical flue pipe.

3. A spark arrester as set forth in claim 1, wherein said perforationsare spaced substantially equally around the surface of said sphericalmember.

4. A spark arrester as set forth in claim 1, wherein said sphericalmember is rotatably supported at one side upon one side of said conduit,and said manually operated means comprises a crank rotatably mountedupon a diametrically opposite side of said conduit having a noncircularportion in driving engagement with the adjacent diametrically oppositeside of said member.

References Cited in the file of this patent UNITED STATES PATENTS509,892 Gray Dec. 5, 1893 526,828 Bell Oct. 2, 1894 544,865 PetersonAug. 20, 1895 986,599 Sizer Mar. 14, 1911 2,061,247 Nordstrom Nov. 17,1936

